1 files changed, 100 insertions, 0 deletions
diff --git a/src/DevHive.Tests/DevHive.Services.Tests/LanguageService.Tests.cs b/src/DevHive.Tests/DevHive.Services.Tests/LanguageService.Tests.cs
new file mode 100644
index 0000000..2ebff58
--- /dev/null
+++ b/src/DevHive.Tests/DevHive.Services.Tests/LanguageService.Tests.cs
@@ -0,0 +1,100 @@
+using System;
+using System.Threading.Tasks;
+using AutoMapper;
+using DevHive.Data.Interfaces.Repositories;
+using DevHive.Data.Models;
+using DevHive.Services.Models.Language;
+using DevHive.Services.Services;
+using Moq;
+using NUnit.Framework;
+
+namespace DevHive.Services.Tests
+{
+	[TestFixture]
+	public class LanguageServiceTests
+	{
+		private Mock<ILanguageRepository> LanguageRepositoryMock { get; set; }
+		private Mock<IMapper> MapperMock { get; set; }
+		private LanguageService LanguageService { get; set; }
+
+		[SetUp]
+		public void SetUp()
+		{
+			this.LanguageRepositoryMock = new Mock<ILanguageRepository>();
+			this.MapperMock = new Mock<IMapper>();
+			this.LanguageService = new LanguageService(this.LanguageRepositoryMock.Object, this.MapperMock.Object);
+		}
+
+		#region Create
+		[Test]
+		public async void Create_ReturnsNonEmptyGuid_WhenEntityIsAddedSuccessfully()
+		{
+			string technologyName = "Gosho Trapov";
+			Guid id = Guid.NewGuid();
+			CreateLanguageServiceModel createLanguageServiceModel = new()
+			{
+				Name = technologyName
+			};
+			Language language = new()
+			{
+				Name = technologyName,
+				Id = id
+			};
+
+			this.LanguageRepositoryMock.Setup(p => p.DoesLanguageNameExistAsync(It.IsAny<string>())).Returns(Task.FromResult(false));
+			this.LanguageRepositoryMock.Setup(p => p.AddAsync(It.IsAny<Language>())).Returns(Task.FromResult(true));
+			this.LanguageRepositoryMock.Setup(p => p.GetByNameAsync(It.IsAny<string>())).Returns(Task.FromResult(language));
+			this.MapperMock.Setup(p => p.Map<Language>(It.IsAny<CreateLanguageServiceModel>())).Returns(language);
+
+			Guid result = await this.LanguageService.CreateLanguage(createLanguageServiceModel);
+
+			Assert.AreEqual(id, result);
+		}
+
+		[Test]
+		public async void Create_ReturnsEmptyGuid_WhenEntityIsNotAddedSuccessfully()
+		{
+			string languageName = "Gosho Trapov";
+
+			CreateLanguageServiceModel createLanguageServiceModel = new()
+			{
+				Name = languageName
+			};
+			Language language = new()
+			{
+				Name = languageName
+			};
+
+			this.LanguageRepositoryMock.Setup(p => p.DoesLanguageNameExistAsync(It.IsAny<string>())).Returns(Task.FromResult(false));
+			this.LanguageRepositoryMock.Setup(p => p.AddAsync(It.IsAny<Language>())).Returns(Task.FromResult(false));
+			this.MapperMock.Setup(p => p.Map<Language>(It.IsAny<CreateLanguageServiceModel>())).Returns(language);
+
+			Guid result = await this.LanguageService.CreateLanguage(createLanguageServiceModel);
+
+			Assert.IsTrue(result == Guid.Empty);
+		}
+
+		[Test]
+		public void Create_ThrowsArgumentException_WhenEntityAlreadyExists()
+		{
+			string exceptionMessage = "Technology already exists!";
+			string languageName = "Gosho Trapov";
+
+			CreateLanguageServiceModel createLanguageServiceModel = new()
+			{
+				Name = languageName
+			};
+			Language language = new()
+			{
+				Name = languageName
+			};
+
+			this.LanguageRepositoryMock.Setup(p => p.DoesLanguageNameExistAsync(It.IsAny<string>())).Returns(Task.FromResult(true));
+
+			Exception ex = Assert.ThrowsAsync<ArgumentException>(() => this.LanguageService.CreateLanguage(createLanguageServiceModel));
+
+			Assert.AreEqual(exceptionMessage, ex.Message, "Incorecct exception message");
+		}
+		#endregion
+	}
+}